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VIENNA, AUSTRIA - APRIL 16: Charles (R) and Diana, Princess of Wales, attend a state reception during their official visit to Austria on April 16, 1986. (Photo by Georges De Keerle/Getty Images)

VIENNA, AUSTRIA - APRIL 16:  Charles (R) and Diana, Princess of Wales, attend a state reception during their official visit to Austria on April 16, 1986.  (Photo by Georges De Keerle/Getty Images)